A circuit is constructed with four resistors, one inductor, one battery and a switch as shown. The values for the resistors are: R1 = R2 = 78 Ω, R3 = 108 Ω and R4 = 123 Ω. The inductance is L = 222 mH and the battery voltage is V = 24 V.
What is IL(∞), the magnitude of the current through the inductor after the switch has been closed for a very long time. https://www.smartphysics.com/Content/smartPhysics/Media/Images/EM/18/h18_RL_limits.png

Question

anonymous · Answer

What is I2(0), the magnitude of the current through the resistor R2 just after the switch is closed?

radar · Answer

Part A.  After a long time the current thru the inductor would be approx 0.12 Amp (considering the DC resistance of the coil as 0 Ohms)

radar · Answer

The coil effectively shunts the current around the two resistors in parallel and the current is limited by the 78 and 123 Ohm resistors in series.

radar · Answer

At the initial opening of the switch the current thru R2 would be 24/387 or 0.062 Amps